Role of assimilates and phosphates in the control of internode elongation in tall and dwarf indica rice varieties
1988
Pattanaik, P.K. | Mohapatra, P.K.
Six indica rice varieties belonging to three duration groups, each group containing one tall and one dwarf variety, were grown under irrigated field conditions during the wet season of 1986. At the time of culm elongation,the distal 5-6 internodes of a variety elongated. The pattern of extension was hierarchical, each successive internode dominating the one immediately below itand hence the final internode lengths increased in acropetal fashion from the bottom to the top. Between the tall and dwarf varieties, the lengths of the individual internodes did not differ much in the apical and basal positions, but significant differences were found between the lengths of the middle internodes. With increase in length, the internodes became visibly thinner and dry matter content per unit length decreased. Analyses of soluble carbohydrates, amino acids, and phosphate contents of the internodes indicated that the concentration of the metabolites increased in acropetal succession from the base to the apex. In general, the dwarf varieties contained at least the same,if not a higher concentration of the metabolites as the tall varieties. The possible role of the metabolites in internode extension is discussed.
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